// Copyright 2008 Thiago H. de Paula Figueiredo

 //

 // Licensed under the Apache License, Version 2.0 (the "License");

 // you may not use this file except in compliance with the License.

 // You may obtain a copy of the License at

 //

 //     http://www.apache.org/licenses/LICENSE-2.0

 //

 // Unless required by applicable law or agreed to in writing, software

 // distributed under the License is distributed on an "AS IS" BASIS,

 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 // See the License for the specific language governing permissions and

 // limitations under the License.

 package br.com.arsmachina.tapestrycrud.components;

 import org.apache.tapestry5.BindingConstants;

 import org.apache.tapestry5.annotations.Parameter;

 import org.apache.tapestry5.annotations.Property;

 import org.apache.tapestry5.annotations.SupportsInformalParameters;

 import org.apache.tapestry5.corelib.base.AbstractLink;

 import org.apache.tapestry5.ioc.annotations.Inject;

 import br.com.arsmachina.tapestrycrud.encoder.ActivationContextEncoder;

 import br.com.arsmachina.tapestrycrud.encoder.Encoder;

 import br.com.arsmachina.tapestrycrud.services.ActivationContextEncoderSource;

 /**

  * A replacement to {@link org.apache.tapestry5.corelib.components.PageLink} that, given an object

  * passed as parameter, uses the corresponding {@link Encoder} to get the context

  * {@link Encoder#toKey(Object) } activation value.

  * 

  * @author Thiago H. de Paula Figueiredo

  */

 @SupportsInformalParameters

 public class ActivationContextPageLink extends AbstractLink {

         /**

          * The logical name of the page to link to.

          */

         @SuppressWarnings("unused")

         @Parameter(required = true, defaultPrefix = BindingConstants.LITERAL)

         @Property

         private String page;

         /**

          * The object from which the activation context value will be extracted.

          */

         @Parameter(required = true)

         private Object object;

         @Inject

         private ActivationContextEncoderSource activationContextEncoderSource;

         @SuppressWarnings("unchecked")

         public Object getContext() {

                 ActivationContextEncoder encoder;

                 encoder = activationContextEncoderSource.get(object.getClass());

                 return encoder.toActivationContext(object);

         }

 }